package org.vidge.util;

import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.DirectColorModel;
import java.awt.image.IndexColorModel;
import java.awt.image.WritableRaster;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class ImgConverUtil {

	static ImageData createSampleImage(Display display) {
		Image image = new Image(display, 100, 100);
		Rectangle bounds = image.getBounds();
		GC gc = new GC(image);
		gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
		gc.fillRectangle(bounds);
		gc.setBackground(display.getSystemColor(SWT.COLOR_GREEN));
		gc.fillOval(0, 0, bounds.width, bounds.height);
		gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
		gc.drawLine(0, 0, bounds.width, bounds.height);
		gc.drawLine(bounds.width, 0, 0, bounds.height);
		gc.dispose();
		ImageData data = image.getImageData();
		image.dispose();
		return data;
	}

	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setText("SWT Image");
		ImageData data;
		if (args.length > 0) {
			String fileName = args[0];
			data = new ImageData(fileName);
		} else {
			data = createSampleImage(display);
		}
		final Image swtImage = new Image(display, data);
		final BufferedImage awtImage = convertToAWT(data);
		final Image swtImage2 = new Image(display, convertToSWT(awtImage));
		shell.addListener(SWT.Paint, new Listener() {

			public void handleEvent(Event e) {
				int y = 10;
				if (swtImage != null) {
					e.gc.drawImage(swtImage, 10, y);
					y += swtImage.getBounds().height + 10;
				}
				if (swtImage2 != null) {
					e.gc.drawImage(swtImage2, 10, y);
				}
			}
		});
		@SuppressWarnings("serial")
		Frame frame = new Frame() {

			public void paint(Graphics g) {
				Insets insets = getInsets();
				if (awtImage != null) {
					g.drawImage(awtImage, 10 + insets.left, 10 + insets.top, null);
				}
			}
		};
		frame.setTitle("AWT Image");
		shell.setLocation(50, 50);
		Rectangle bounds = swtImage.getBounds();
		shell.setSize(bounds.width + 50, bounds.height * 2 + 100);
		Point size = shell.getSize();
		Point location = shell.getLocation();
		Insets insets = frame.getInsets();
		frame.setLocation(location.x + size.x + 10, location.y);
		frame.setSize(size.x - (insets.left + insets.right), size.y - (insets.top + insets.bottom));
		frame.setVisible(true);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		if (swtImage != null)
			swtImage.dispose();
		if (swtImage2 != null)
			swtImage.dispose();
		frame.dispose();
		System.exit(0);
	}

	static BufferedImage convertToAWT(ImageData data) {
		ColorModel colorModel = null;
		PaletteData palette = data.palette;
		if (palette.isDirect) {
			colorModel = new DirectColorModel(data.depth, palette.redMask, palette.greenMask, palette.blueMask);
			BufferedImage bufferedImage = new BufferedImage(colorModel, colorModel.createCompatibleWritableRaster(data.width, data.height), false, null);
			WritableRaster raster = bufferedImage.getRaster();
			int[] pixelArray = new int[3];
			for (int y = 0; y < data.height; y++) {
				for (int x = 0; x < data.width; x++) {
					int pixel = data.getPixel(x, y);
					RGB rgb = palette.getRGB(pixel);
					pixelArray[0] = rgb.red;
					pixelArray[1] = rgb.green;
					pixelArray[2] = rgb.blue;
					raster.setPixels(x, y, 1, 1, pixelArray);
				}
			}
			return bufferedImage;
		} else {
			RGB[] rgbs = palette.getRGBs();
			byte[] red = new byte[rgbs.length];
			byte[] green = new byte[rgbs.length];
			byte[] blue = new byte[rgbs.length];
			for (int i = 0; i < rgbs.length; i++) {
				RGB rgb = rgbs[i];
				red[i] = (byte) rgb.red;
				green[i] = (byte) rgb.green;
				blue[i] = (byte) rgb.blue;
			}
			if (data.transparentPixel != -1) {
				colorModel = new IndexColorModel(data.depth, rgbs.length, red, green, blue, data.transparentPixel);
			} else {
				colorModel = new IndexColorModel(data.depth, rgbs.length, red, green, blue);
			}
			BufferedImage bufferedImage = new BufferedImage(colorModel, colorModel.createCompatibleWritableRaster(data.width, data.height), false, null);
			WritableRaster raster = bufferedImage.getRaster();
			int[] pixelArray = new int[1];
			for (int y = 0; y < data.height; y++) {
				for (int x = 0; x < data.width; x++) {
					int pixel = data.getPixel(x, y);
					pixelArray[0] = pixel;
					raster.setPixel(x, y, pixelArray);
				}
			}
			return bufferedImage;
		}
	}

	public static ImageData convertToSWT(BufferedImage bufferedImage) {
		if (bufferedImage.getColorModel() instanceof DirectColorModel) {
			DirectColorModel colorModel = (DirectColorModel) bufferedImage.getColorModel();
			PaletteData palette = new PaletteData(colorModel.getRedMask(), colorModel.getGreenMask(), colorModel.getBlueMask());
			ImageData data = new ImageData(bufferedImage.getWidth(), bufferedImage.getHeight(), colorModel.getPixelSize(), palette);
			WritableRaster raster = bufferedImage.getRaster();
			int[] pixelArray = new int[3];
			for (int y = 0; y < data.height; y++) {
				for (int x = 0; x < data.width; x++) {
					raster.getPixel(x, y, pixelArray);
					int pixel = palette.getPixel(new RGB(pixelArray[0], pixelArray[1], pixelArray[2]));
					data.setPixel(x, y, pixel);
				}
			}
			return data;
		} else if (bufferedImage.getColorModel() instanceof IndexColorModel) {
			IndexColorModel colorModel = (IndexColorModel) bufferedImage.getColorModel();
			int size = colorModel.getMapSize();
			byte[] reds = new byte[size];
			byte[] greens = new byte[size];
			byte[] blues = new byte[size];
			colorModel.getReds(reds);
			colorModel.getGreens(greens);
			colorModel.getBlues(blues);
			RGB[] rgbs = new RGB[size];
			for (int i = 0; i < rgbs.length; i++) {
				rgbs[i] = new RGB(reds[i] & 0xFF, greens[i] & 0xFF, blues[i] & 0xFF);
			}
			PaletteData palette = new PaletteData(rgbs);
			ImageData data = new ImageData(bufferedImage.getWidth(), bufferedImage.getHeight(), colorModel.getPixelSize(), palette);
			data.transparentPixel = colorModel.getTransparentPixel();
			WritableRaster raster = bufferedImage.getRaster();
			int[] pixelArray = new int[1];
			for (int y = 0; y < data.height; y++) {
				for (int x = 0; x < data.width; x++) {
					raster.getPixel(x, y, pixelArray);
					data.setPixel(x, y, pixelArray[0]);
				}
			}
			return data;
		}
		return null;
	}
}
